Resistor



Aprl 1960 E. J. KNOUSE 2,931,998

RESISTOR Filed Dec. 13, 1956 JNVEN T OR. E'DGA eJ Kuous United States Patent O RESISTOR Edgar J. Knouse, St. Marys, Pa., assignor to Quality Components, Incorporated, St. Marys, Pa., a corporation of Pennsylvania Application December 1'3, 1956, Serial No. 628,l 74 l Claim. (Cl. 338-324) This invention relates generally to resistors and more particularly to resistors with terminals molded in one face for use with printed circuits.

Molded resistors have for years been made cylindrical in form with the terminals extending axially out of their opposite ends and marked by a series of encircling color coated rings. These terminals must always be bent to connect the resistor to a circuit. The bending of the terminals frequently causes them to fracture the resistor where it projects from the molded resistor. To avoid this the terminals have been made of varyng degrees of hardness or thickness or headed so that only the stern can fiex. This improves the structure but the terminals must still be flexed to direct them to the circuit in which they are connected.

The principal object of this invention is the provision of a resistor that has both terminals extending from one face of the molded resistor. Ordinarily the terminals have to be bent down to be connected to the circuit. When both terminals extend in the same direction they do not have tobe bent relative to the face of the resistor from which they extend. This materially decreases the hazard of fracturing the resistor and destroying the same or changing its measured value.

Another object is the provision of a resistor having terminals extending out of the molded material in the same direction to make the resistor more adaptable to the panel containing the printed circuit. Passages cut through the panel carrying the printed circuit are spaced to receive these terminals and when they pass throughthe panel and the printed circuit a touch of solder or mode of connecting the terminals to the circuit can be readily made between the terminals and the printed side regardless of which side of the panel the resistor is located.

All resistors must necessarily give oli heat as a function of their operation. It is preferable that the resistor is mounted in spaced relation to other members of the circuit as well as to the panel that may carry the printed circuit. When the terminals extend from the same face of the resistors they offer no problem in mounting and securing the resistor to the panel. If the passages to receive the resistor are spaced just a little greater than the spacing between the terminals which limits the entry of the terminals and thus supports the resistor in spaced relation to the panel.

Other objects and advantages appear hereinafter in the following description and claim.

The accompanying drawings show for the purpose of exemplification without limiting this invention or the claim thereto, certain practical embodiments illustrating the princples of this nvention wherein:

Fig. 1 is an enlarged perspective view of a molded resistor having its terminals extending out one face.

Fig. 2 is a similar view of the opposite side of the resistor.

Fig. 3 is an enlarged sectional view of a resistor with increased distance between terminals.

2,931,998 Patented Apr. 5, 1960 Fig. `4' is a perspective view showing the resistor applied to a printed circuit on panel.

Fig. 5 is a sectional view showing a resistor applied to a panel which has circuits on both sides.

Fig. 6 is a sectional view showing another mode 'of holding a resistor spaced from a panel.

Referrng to the drawings the resistor shown in Figs. 1 and 2 is a cylinder 1 having the terminals 2 and 3 extending out of the end 4 the opposite end 5 being marked by parallel colored bands to indicate the measure of the resistance between the terminals.

The terminals are preferably a soft copper wire that has a formed head made by swedging the end.

These pellet type of resistors are molded under pressure. The distance between the headed terminals in combination with the mixture determines the ultimate resistance. The head 6 of the terminals is very close to the surface of the resistor material but they are covered with a sutficient amount of material to avoid any variation of the resistance due to foreign material on the surface of the resistor. In Fig. 3 the cylindrical resistor 7 has an indentation 8 which increases the surface distance between the terminals 2 and 3.

As shown in Fig. 4 the resistor 1 is mounted on the panel 10, the underside of which is provided with an electrical printed circuit 11. It will be noted that the resistor 1 is connected by extending the terminals 2 and 3 through the passages 12 and 13 to the opposite side of the panel where the terminals 2 and 3 may be turned over and soldered or otherwise electrically secured to the printed circuit as indicated at 14.

As shown in Fig. 5 the resistor 15 is not cylindrical in shape and the terminals 16 and 17 extending therefrom have to be spread in order to extend through the passages 18 and 19 of the panel 20. The spreading of the terminals in this manner spaces the resistor 15 above the panel and thus provides uninhibited cooling of the resistor. In this instance the terminals are merely cut short as they project through the passages 18 and 19 and are soldered or otherwise electrically secured to the printed circuit as indicated at 21. The opposite side of the panel 20 from that of the electric circuit may also be provided with conductors such as indicated at 22 secured to the terminal 16 for completing a circuit disassociated with the panel. However the opposite sides of the panel may also be provided with different printed circuits such as indicated at 23.

In the structure as shown in Fig. 6 the resistor is long and cylindrical in shape and is provided with the terminals 24 and 25 extending from one side thereof which terminals are stepped as indicated at 26 so as to support the resistor in spaced relation with the panel 27. The terminals subsequently extend through the passages 28 and 29 and are soldered or otherwise secured to the printed circuit 30 in the other side of the panel. The steps 26 in the conductors 24 and 25 provide a very staunch support for the resistor 31 as this resistor is shown to be considerably larger and heavier than the other type of smaller resistors previously illustrated. Although the terminals are extending from a cylindrical surface they are extending from the same side of the pellet and are substantially parallel from one another.

Referring again to Fig. 5 the resistance 15 may have a third terminal such as indicated at 31 and which extends through the opening 32 and is connected to the circuit 33 on the opposite side of the panel 20 which in this instance could be employed to provide a resistance between the circuits 21 and 33 and 23 and 33 and still provide a resistance between the terminals 16 and 17. 'Ihus with the extra lead one can provide a total of three resistances in a single resistor wherein any one of the three leads could be the common junction.

`lli: -An electric'al resistor conssting of'at'lst'tw'o bn'cl'a'ble' conducting metal terminal 'lead wires, an integral head on each lead wire, an integfal body of resistance material havi'ngits oute'r suffac'e'complet'ely exposed to'th'eair nd completely covering the 'heads and "a'dj'cent "portions 'of `t`he lead wires to'di'ectly and intim'at'e'ly enga g e the heads and wires to makeelectrical contacfltherewith,said'lead 'Wifs extendngparallel to each other and proj'ec't'ingonly in one direction beyond one snrface 'of the resistor'body 'fot :chnecton 'with electrical circuits without injuring 'the restance contact o'r interferng withthe sitface rafdiation of the resistor body, each of'said solid Wir'e leads being bent to form a step in a common plane parallel with the exterior surface of the rcsistor bodyto support the Titdr i fixed `sd "reltin fmi-.h the fet "fo which it is attached. I

V References Cited in the file of this patent UNITED STATES PATENTS 2,079,369 Bradley-. May 4, 1937 2,203,996 Megow et al. June 11, 1940 2,698,372 Patla Dec. 2 8, 1954 TH'ER REFEREN'CES Tele-Tech 8: Electronic Industries, November 1953, page 47.

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